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(No Model.)

W. S. CHAR MOLD F0 ISM LIG No. 595,267. Patented Dec. 7, 1897.

ll'nrrn Sra'rns A'IENT OFFICE.

\VILLIAM S. MACI-IARG, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE LUXFER PRISM PATENTS COMPANY, OF SAME PLACE.

MOLD FOR PRISM-LIGHTS.

SPECIFICATION forming part of Letters Patent No. 595,267, dated December '7, 1897.

Application filed October 2, 1897. Serial No, 653,774- (No model.)

To all whom it may concern.-

Be it known that I, IVILLIAM S. BIACI'IARG, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Molds for Prism-Lights, of which the following is a specification.

My invention relates to molds particularly intended for molding prism-lights. Broadly speaking, however, it is applicable to any case where the articles to be molded are of such a nature that under the ordinary conditions as they exist in molds there will be a thin upwardly-projecting ou ter portion in the bottom of the mold. My invention is designed to obviate this dit'liculty and to provide a mold having such upwardly-projecting thin portions on the bottom or design-forming part so constructed that the outer upwardlyprojecting thin portions will not lie along the inner edges.

My invention is illustrated in the accompanying drawings, wherein- Figure l is a plan view of an open mold with a bottom intended to produce the prisms on a prism-light. Fig. 52 is a section on the line 2 2 of Fig. 1; but the old form of the mold is here illustrated by dotted lines.

Like parts are indicated by the same letter in both figures.

A A constitutes the outer shell or case of the mold, preferably having the stand B and the inner upper ledge C for the upper portionsorringA. Upwardlyprojectingthrough the stand B is the screw D, which passes into the forming-piece or bottom of the mold E. This bottom piece is provided with a series of upwardly-projecting ridges or portions F, so related to each other and so shaped and formed in cross-section as to produce in or upon the piece to be molded a series of prisms.

G is the plunger, and H the prism-light in the process of being formed. J J represent inwardly-projecting portions formed on the shell or case A. In the old or former style of molds these portions were not formed on the ring or case A, but were connected with the former E, being divided from the ring A at the dotted lines. In the old form of the de Vice it is evident that the former E, having these pieces J J attached to it, would present on its outer edges sharp upwardly-projecting comparatively thin pieces along these edges, and since in the process of molding glass the 55 parts of the mold E are subjected to great heat it will readily be seen that these edges were liable to injury from the heat and also were liable to be easily broken in the process of handling. The result was that the former E was comparatively short-lived. By thus dividing the former, as indicated, so the two parts of it are connected with the case or ring A this difficulty, as will be seen by inspecting the drawings, is entirely removed. In the molding of prism-lights it is necessary,

as will be seen from an inspection of the drawings, to have the surface divided into these sharp ridges or projecting parts. It is also important to have each prism on the prism-light perfect and complete in cross-section. In other words, it is necessary to have the entire full base of each prism developed on the prism-light, as is the case with the prism-lightillustratedin the drawings. This necessitated the formation of the mold, as i11- dicated by dotted lines, and my improve ment, while retaining the necessary form of the prism-light, removes the danger to the prism-mold.

Of course I do not wish to limit myself to the use of this invention in connection with molds for making prism-lights, as doubtless it can be applied to many other articles.

I clain1-- A mold for prism-lights comprising a former, ridged or grooved, each ridge having two glass-forming sides in combination with a surrounding ring or case having inwardlyprojecting portions on opposite sides to coact' 0 with the opposed surfaces of the outer ridges on the former proper, thus to produce outer prisms on the prism-lights, each of which shall have two sides, as described.

WILLIAM S. MACI-IARG.

Witnesses:

DONALD M. CARTER, HOMER L. KRAFT. 

